How to reset my JVC-R740BT - JVC KD-R740BT

The process for resetting the password on a JVC KW-V850BT car stereo may vary depending on the specific model and software version. Here are some general steps you can try to reset the password on the JVC KW-V850BT:

1. Disconnect the battery: Disconnect the battery of your car for at least 30 seconds, then reconnect it. This will reset the car stereo to its default settings.
2. Press the reset button: If your JVC KW-V850BT has a reset button, press it and hold it for a few seconds until the unit restarts. This should reset the password to the default setting.
3. Check the manual: Refer to the manual of your JVC KW-V850BT to see if there are any specific instructions for resetting the password.
4. Contact the manufacturer: If you are still unable to reset the password, contact JVC customer support for further assistance.

It's worth noting that depending on the model and software version, the option to reset the password may not be available. In that case, you would have to contact the manufacturer for further assistance.

If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

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[PDF]LCD Television Users Guide - JVC

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I would recommend initializing the Bluetooth and then disconnect pairing on cell phone. You will loose phone numbers but it can be downloaded again. Hope this helps

Check speaker wires. All four speakers must be independent. Means no shorting to chassis.

Check the DVD player to ensure that you do not have a DVD disc inserted into the device. Press the "Eject" button and lift out any DVD present in the device.

Turn off your JVC DVD player.

Unplug the device from the power source.

Examine the front or rear of your DVD player and note the model number.

Reset your particular device using the "DVD Reset Procedures" documentation provided by JVC (see Resources). Cross-reference your particular device's model number with the instructions provided within the reset procedure documentation

Read more: How to Reset a JVC DVD Player ' eHow.com http://www.ehow.com/how_6940950_reset-jvc-dvd-player.html#ixzz16g5rec91

Scroll down the menu till you see "Lamp Reset " press Enter and your done..

Please locate RESET push button in camera (its tinny button pushed by ballpen) and perform reset.
2nd possibility is broken ribbon wire connecting lcd and main board of camera. in this case you need qualified technician or JVC service center.